Cheyenne River in Custer County: Late/Upper Campanian, South Dakota
collected by University of Kansas Geological Expedition 1894
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Reptilia
- Mosasauridae
|
||||||||||
|
Mosasaurus horridus n. sp.
Williston 1895
|
1 individual | |||||||||
| KU 1034, skull | ||||||||||
|
Prognathodon overtoni n. sp.
(Williston 1897)
|
Russell 1964 | 1 specimen | ||||||||
| KU 950 - type (skull) | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | South Dakota | County: | Custer |
| Coordinates: | 43.5° North, 103.1° West (view map) | ||||
| Paleocoordinates: | 49.4° North, 71.0° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Campanian | 10 m.y. bin: | Cretaceous 7 |
| Key time interval: | Late/Upper Campanian | ||
| Age range of interval: | 83.60000 - 72.10000 m.y. ago |
Stratigraphy
| Geological group: | Montana | Formation: | Pierre Shale | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: upper Pierre; Prognathodon overtoni found 100 ft above Mosasaurus horridus | |||||
Lithology and environment
| Primary lithology: | "shale" |
| Includes fossils? | Y |
| Lithology description: "Like most specimens from the Pierre Cretaceous it was enclosed originally in a hard, nodular matrix of a bluish color, from which the larger part of the skull had gradually been oxidized, leaving the bones in the utmost perfection." | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body,concretion |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | excellent |
| Abundance in sediment: | few |
| Spatial resolution: | parautochthonous |
Collection methods and comments
| Collection methods: | survey of museum collection | ||
| Collection size: | 2 specimens | ||
| Reason for describing collection: | general faunal/floral analysis | ||
| Collectors: | University of Kansas Geological Expedition | Collection dates: | 1894 |
| Collection method comments: Prognathodon overtoni found by T. R. Overton | |||
Metadata
| Database number: | 107780 | ||
| Authorizer: | M. Carrano | Enterer: | H. Street |
| Modifier: | M. Carrano | Research group: | vertebrate |
| Created: | 2011-04-15 05:50:15 | Last modified: | 2021-05-14 09:44:34 |
| Access level: | the public | Released: | 2011-04-15 05:50:15 |
| Creative Commons license: | CC BY |
Reference information